Using Fisher-Lee relation [1]}, the two-terminal transmission
probability can be written as,
\(T= {\mbox{Tr}} \left[ \mbox{$\Gamma $}_S\mbox{$G$}^r_{\mbox{\tiny lad}} \mbox{$\Gamma $}_D\mbox{$G$}^a_{\mbox{\tiny lad}} \right]\) 
